A bluez security update has been released for both Debian GNU/Linux 9 and 10 to fix an issue that BlueZ's HID and HOGP profile implementations don't specifically require bonding between the device and the host.

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Debian Security Advisory DSA-4647-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
March 26, 2020   https://www.debian.org/security/faq
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Package : bluez
CVE ID : CVE-2020-0556
Debian Bug : 953770

It was reported that the BlueZ's HID and HOGP profile implementations
don't specifically require bonding between the device and the host.
Malicious devices can take advantage of this flaw to connect to a target
host and impersonate an existing HID device without security or to cause
an SDP or GATT service discovery to take place which would allow HID
reports to be injected to the input subsystem from a non-bonded source.

For the HID profile an new configuration option (ClassicBondedOnly) is
introduced to make sure that input connections only come from bonded
device connections. The options defaults to 'false' to maximize device
compatibility.

For the oldstable distribution (stretch), this problem has been fixed
in version 5.43-2+deb9u2.

For the stable distribution (buster), this problem has been fixed in
version 5.50-1.2~deb10u1.

We recommend that you upgrade your bluez packages.

For the detailed security status of bluez please refer to its security
tracker page at:
  https://security-tracker.debian.org/tracker/bluez

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/